Question

An aluminum sphere, radius = 10 cm, is to be hollowed out so that it will...

An aluminum sphere, radius = 10 cm, is to be hollowed out so that it will not sink in water. What is the
minimum radius of the hollow? (density of Al = 2.70 g/cm3).

I've tried to solve this problem several times, but my answers just have not been making sense. Please walk me through the thought process and way to conceptualize this problem.

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